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Jet Sprint Boat by Rod Commander   Posted: 12 days ago
Hi Dave Yea we have the same rules down under with not being able to use petrol powered boats on local lakes but this one will be used on smallish river rapids so well away fro the locals Be a while yet before I get to test it Much to do to complete the model

Jet Sprint Boat by Rod Commander   Posted: 12 days ago
Jet Sprint Boat

Jet Sprint Boat by saintsalvio Commander   Posted: 13 days ago
Great work it will fly on the water surface

Jet Sprint Boat by RNinMunich Fleet Admiral!   Posted: 13 days ago
Mighty meaty! 👍 Good luck with the 'Messcave' 😉 I have the same problem 🤔 Pics show (amongst accumulated junk from various repair jobs!) - electrics bench and boxes of 'stuff' acquired over the last few years of my working life still waiting to be sorted out 😉 - various ships waiting to be refurbished or fitted out; HMS Hotspur 1:72 H class destroyer 1936, HMS Belfast 1:128 6" light cruiser U25 (or 26?) 1:72 Type IIA U-boat 1936 Billings Gina Danish fish cutter Graupner Southampton Various Plastic Magic projects (stash!) - the bigger ones; HMS Hood, Ark Royal, Illustrious, Type 45, USS Enterprise (The Big E), Bismarck all 1:350; USS Fletcher destroyer 1:144, are down in the cellar, the bench down there is just as bad 😡! and finally - my poor old Sea Scout being sanded on the kitchen worktop for lack of space on the bench! 😭 "Stuff accumulates to fill the space available for it" 😉 cheers Doug 😎 Oh! Nearly forgot 😲! and there's a 1:128 Graf Spee pocket battleship on a shelf in the living room, waiting for propshaft repairs.

Jet Sprint Boat by rolfman2000 Lieutenant   Posted: 14 days ago
Wonders. Looks fab. And with that amount of power should move as well. Our lake prohibits petrol or nitro boats, so big brushless would be out preference with maybe a 2 x 6s Lipos in series giving 12s power. Best wishes Rod. Good luck cleaning the man cave. Cheers, Dave W 😊

Jet Sprint Boat by Midlife306 Captain   Posted: 14 days ago
Perfect choice Rod👍 🐸

Jet Sprint Boat by RNinMunich Fleet Admiral!   Posted: 14 days ago
Great idea 👍 on the transom as well 😉😎

Jet Sprint Boat by figtree7nts Fleet Admiral!   Posted: 14 days ago
I would put Kermit on her bow.

Jet Sprint Boat by figtree7nts Fleet Admiral!   Posted: 14 days ago
Great Color! easily spotted on the water!

Jet Sprint Boat by Rod Commander   Posted: 15 days ago
First coat of paint is applied Very pleased with result Kawasaki green so I can spot it on the water easier Think I will name it Kermit and paint him on it somewhere What do you think ?

Jet Sprint Boat by philpjuk Chief Petty Officer   Posted: 17 days ago
Thanks Dave,will build up to speed in increments,as my mate says "the throttle works both ways"!

Jet Sprint Boat by Dave M Fleet Admiral!   Posted: 18 days ago
Hi Phil No problem I enjoy tasking opportunities to expand my knowledge. Weight distribution can be critical in marine craft and your solution should help control the lifting problem. With the mono you should not experience the problem, but with lots of power and a very aggressive jet of water I would expect the initial 1 to 2 secs to be interesting and you will need to be on your toes to keep it straight!

Jet Sprint Boat by philpjuk Chief Petty Officer   Posted: 18 days ago
Hi Dave,sorry the problem with sponson lift is with a prop driven strimmer powered boat,it is always the same sponson that lifts and this is due to prop torque.As it is a "pickle fork" type boat I am going to make it asymetric putting the hull nearer the lifting sponson and move the fuel tank and radio battery from behind the motor to the front.I asked the question to see if anyone thought I may have trouble with my jet boat,(this is a mono hull).This is all my fault,I insist on fitting engines with far too much power into every thing!cars,motorbikes and boats,(I have bought a coventy climax fire pump to fit in my 11 foot sailing dinghy!).

Jet Sprint Boat by Dave M Fleet Admiral!   Posted: 18 days ago
Hi Phil I have no experience with three point hydro so any suggestions / observations are not based on personal experience. Is it always the same sponson that lifts? With three points of contact any slight misalignment or weight difference could result in one point digging in and raising the other. This would be made worse if the thrust nozzle was slightly misaligned. As Doug has pointed out the full size were difficult to keep in a straight line. You haven't said but I assume you correct the lift by turning the Nozzle. When I used to fly model planes I used to apply slight right rudder to keep the model straight on take-off and I wonder if you could apply a similar principle to your model. This is real cutting edge modelling and I look forward to hearing how you progress. Dave

Jet Sprint Boat by philpjuk Chief Petty Officer   Posted: 18 days ago
Thanks Dave,no the dinghy had no torque reaction on a steady throttle just when the engine was "blipped".I started with a butterfly flap in the nozzle which worked ok,replaced that with a steerable tube beyond the nozzle which also worked ok and finally with the nozzle itself steerable mounted on a flexible pipe which did not work (the flexible pipe was far from flexible when full of water at pressure!).The question was because I have built a three point hydro with a strimmer engine which becomes two point due to torque,lifting one sponson as the throttle is opened.